Mercurial > hg > release > thermostat-0.5
view host-memory/agent/src/main/java/com/redhat/thermostat/host/memory/agent/internal/MemoryStatBuilder.java @ 892:4c8a876b9dc0
Create Host Memory agent and common bundles
This commit extracts Host Memory data collection from SystemBackend into
a host-memory-agent bundle. It also moves the MemoryStatDAO from
common-core into a host-memory-common bundle that registers the DAO once
Storage is available. This also removes the DAO from DAOFactory.
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2013-January/004994.html
author | Elliott Baron <ebaron@redhat.com> |
---|---|
date | Mon, 07 Jan 2013 15:46:47 -0500 |
parents | system-backend/src/main/java/com/redhat/thermostat/backend/system/MemoryStatBuilder.java@7c97a7125993 |
children | ccac9bcabaa0 |
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/* * Copyright 2012 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.host.memory.agent.internal; import java.io.BufferedReader; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import com.redhat.thermostat.common.NotImplementedException; import com.redhat.thermostat.common.Size; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.storage.model.MemoryStat; import com.redhat.thermostat.utils.ProcDataSource; /** * Implementation note: uses information from /proc/ */ public class MemoryStatBuilder { private static final long UNAVAILABLE = -1; private static final String KEY_MEMORY_TOTAL = "MemTotal"; private static final String KEY_MEMORY_FREE = "MemFree"; private static final String KEY_BUFFERS = "Buffers"; private static final String KEY_CACHED = "Cached"; private static final String KEY_SWAP_TOTAL = "SwapTotal"; private static final String KEY_SWAP_FREE = "SwapFree"; private static final String KEY_COMMIT_LIMIT = "CommitLimit"; private static final Logger logger = LoggingUtils.getLogger(MemoryStatBuilder.class); private final ProcDataSource dataSource; public MemoryStatBuilder(ProcDataSource dataSource) { this.dataSource = dataSource; } protected MemoryStat build() { long timestamp = System.currentTimeMillis(); long total = UNAVAILABLE; long free = UNAVAILABLE; long swapTotal = UNAVAILABLE; long swapFree = UNAVAILABLE; long buffers = UNAVAILABLE; long cached = UNAVAILABLE; long commitLimit = UNAVAILABLE; try (BufferedReader reader = new BufferedReader(dataSource.getMemInfoReader())) { String line = null; while ((line = reader.readLine()) != null) { String[] parts = line.split(":"); if (parts.length == 2) { String key = parts[0].trim(); long value = getValue(parts[1].trim()); if (key.equals(KEY_MEMORY_TOTAL)) { total = value; } else if (key.equals(KEY_MEMORY_FREE)) { free = value; } else if (key.equals(KEY_SWAP_TOTAL)) { swapTotal = value; } else if (key.equals(KEY_SWAP_FREE)) { swapFree = value; } else if (key.equals(KEY_BUFFERS)) { buffers = value; } else if (key.equals(KEY_CACHED)) { cached = value; } else if (key.equals(KEY_COMMIT_LIMIT)) { commitLimit = value; } } } } catch (IOException ioe) { logger.log(Level.WARNING, "unable to read memory info"); } return new MemoryStat(timestamp, total, free, buffers, cached, swapTotal, swapFree, commitLimit); } private long getValue(String rawValue) { String[] parts = rawValue.split(" +"); String value = rawValue; String units = null; if (parts.length > 1) { value = parts[0]; units = parts[1]; } long result = UNAVAILABLE; try { result = Long.parseLong(value); if (units != null) { // /proc/meminfo uses kB instead of KiB, incorrectly if (units.equals("kB") || units.equals("KB")) { result = (long) new Size(result, Size.Unit.KiB).convertTo(Size.Unit.B).getValue(); } else { throw new NotImplementedException("unit conversion from " + units + " not implemented"); } } } catch (NumberFormatException nfe) { logger.log(Level.WARNING, "error extracting memory info"); } return result; } }